Document Type
Article
Publication Title
Monthy Notices of the Royal Astronomical Society
Abstract
The groundbreaking detection of gravitational waves produced by the inspiralling and coales- cence of the black hole (BH) binary GW150914 confirms the existence of ‘heavy’ stellar-mass BHs with masses >25 M . Initial characterization of the system by Abbott et al. supposes that the formation of BHs with such large masses from the evolution of single massive stars is only feasible if the wind mass-loss rates of the progenitors were greatly reduced relative to the mass-loss rates of massive stars in the Galaxy, concluding that heavy BHs must form in low-metallicity (Z ,:S 0.25 0.5 Z ) environments. However, strong surface magnetic fields also provide a powerful mechanism for modifying mass-loss and rotation of massive stars, independent of environmental metallicity. In this paper, we explore the hypothesis that some heavy BHs, with masses >25 M such as those inferred to compose GW150914, could be the natural end-point of evolution of magnetic massive stars in a solar-metallicity environment. Using the MESA code, we developed a new grid of single, non-rotating, solar-metallicity evo- lutionary models for initial zero-age main sequence masses from 40 to 80 M that include, for the first time, the quenching of the mass-loss due to a realistic dipolar surface magnetic field. The new models predict terminal-age main-sequence (TAMS) masses that are signifi- cantly greater than those from equivalent non-magnetic models, reducing the total mass lost by a strongly magnetized 80 M star during its main-sequence evolution by 20 M . This corresponds approximately to the mass-loss reduction expected from an environment with metallicity Z = 1/30
First Page
1052
Last Page
1060
DOI
10.1093/mnras/stw3126
Publication Date
12-2016
Recommended Citation
Petit, V.; Keszthelyi, Z.; MacInnis, R.; Cohen, D. H.; Townsend, R. H. D.; Wade, G. A.; Thomas, S. L.; Owocki, S. P.; Puls, J.; and ud-Doula, A., "Magnetic Massive Stars As Progenitors Of ‘Heavy’ Stellar-Mass Black Holes" (2016). Aerospace, Physics, and Space Science Faculty Publications. 674.
https://repository.fit.edu/apss_faculty/674
